create initial README

README.md

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+## Build and grow massive on-line communities with Rocket.Chat
+
+
+### Developer quick start
+
+During development, our  data provider is a headless CMS, strapi.  It is used only during development and build time, not during production.
+
+Start strapi in a shell: 
+
+```
+git clone https://github.com/rocketchat/RC4Community
+cd backend
+npm i
+npm run develop
+```
+Check http://localhost:1337 to access strapi.   
+
+If you're using WSL2 on Windows also running Docker Desktop,  port 1337 may not be available on your system.   To use port 3000 instead,  change this line in  `config/server.js` file:
+
+```
+  port: env.int('PORT', 3000),
+``` 
+The application is written on nextjs and deployable on all nextjs compatible microservices and scaled deployment platforms.
+
+Start the application in a shell:
+
+```
+cd ../frontend
+npm i
+npm run dev
+```
+
+Now RC4Community should be accessible from http://localhost:8090 
+
+If you've changed the strapi  port to 3000,  use the following line to start the application instead:
+
+```
+export NEXT_PUBLIC_STRAPI_API_URL=http://localhost:3000;npm run dev
+```
+
+
+You can now modify code in the application via standard nextjs dev workflow and following its best practices.
+